Question 1129485
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Let the width be w.  Then the problem tells us the length is 3 less than 5 times the width:<br>
l = 5w-3<br>
We are also told that the perimeter (2l+2w) is 10 times the width:<br>
2l+2w = 10w
2l = 8w
l = 4w<br>
We have two different expressions for the length in terms of the width; those two expressions must be equal:<br>
5w-3 = 4w
w = 3<br>
l = 4w = 12<br>
The rectangle is 12x3.